I have a 2002 Jeep Grand Cherokee Laredo with the 6 cylinder engine. I replaced the thermostat and the water pump and it is still overheating. The heat is blowing cold as well.
If you put the thermostat in correctly (spring towards the engine) that should be OK. Likely if the water pump wasn't leaking or had a bad bearing, you wasted your $ on that.
If you re-filled it and did not have the heater on high heat, you may have some trapped air in there. But, still overheating says another thing. If you have a blown head gasket, it can pump compression into the cooling system and drive the coolant from the core. It will also overheat. You can have that tested at most any decent shop that will do a hydrocarbon test to find that.I think someone makes a chemical test kit for that but not sure if it's very expensive or not. White smoke from tailpipe will also be an indicator as will be any coolant in the engine oil or coolant on one or more spark plugs. If it turns out that it has a head gasket problem don't stop looking for problems as often a faulty fan or obstructed radiator can cause the initial overheat that caused the gasket to fail.
Testimonial: "Thank you. I was hoping not to hear head gasket, but that's where it seems to be leaning towards."
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Thanks. I will have it tested first, the $50 for a water pump was no big deal and it took no time, but the head gasket is not something easy to do, so I'll have a diagnostic run first before going that route.
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